MXPA06002444A

MXPA06002444A - Fiber optic cable and furcation module.

Info

Publication number: MXPA06002444A
Application number: MXPA06002444A
Authority: MX
Inventors: Steven C Zimmel
Original assignee: Adc Telecommunications Inc
Priority date: 2003-09-08
Filing date: 2004-09-01
Publication date: 2006-08-31
Also published as: WO2005036232A3; CN1849538B; US20050053341A1; US8311379B2; CN102289045B; ES2831377T3; HK1091552A1; CA2537780C; AU2004281024A1; ES2364251T3; EP2275848B1; ATE514112T1; CN1849538A; WO2005036232A2; US20050185910A1; USRE47069E1; CA2537780A1; EP1664878B1; CN102289045A; EP2275848A3

Abstract

An optical fiber cable assembly comprising an optical fiber slidably enclosed within a hollow tubing, both the fiber and the tubing having corresponding first and second ends. The cable is terminated with the first and second ends of the tubing and the fiber constrained with respect to each other such that fiber and the tubing are approximately the same length when the cable is at a first temperature. The tubing is made of a material which contracts more than the optical fiber when the cable is exposed to temperatures below the first temperature, such that the fiber is longer than the tubing and excess fiber length is formed. An intermediate portion of the tubing permits the excess fiber length to accumulate without bending in a radius smaller than a minimum bend radius.

Description

OPTICAL FIBER CABLE AND BIFURCED MODULE Field The present invention relates, generally, to a fiber optic cable construction and a bifurcated module construction BACKGROUND Optical fiber cables are typically composed of a variety of linear elements, which are terminated and linearly constrained with respect to each other. These elements may include the optical fiber itself, tubular cover materials, linear resistance elements and outer layers to seal the elements from environmental damage from rain and other moisture. Each of these elements can have a different thermal expansion coefficient, temperatures close to the ambient temperature, present when the cable is assembled and terminated, the differences in the thermal expansion of the various elements is not significant enough to cause any attenuation or loss of insertion to the optical signals that are transmitted by the cable.

However, as these cables are exposed to more extreme temperatures with respect to the ambient temperature, at the time of assembly and termination, the different coefficients of thermal expansion can become more significant. Fiber optic cables can be exposed to operating temperatures up to thirty-eight degrees centigrade by removing them from the ambient temperature of the assembly and termination. At these temperatures, the different degrees of elongation or contraction between the elements of the cable can damage the fiber or can cause unacceptable amounts of attenuation or loss of insertion of the signals that are transmitted by the cable. Improvements in known optical fiber cables to direct the stresses induced by temperature are convenient.

SUMMARY The present invention relates to a fiber optic cable assembly, comprising enclosed optical fibers, in sliding form, inside a hollow pipe, both the fiber and the pipe have corresponding first and second ends. The cable is terminated with the first and second ends of the pipe and the fiber constricted together, so that the fiber and the pipe are approximately the same length, when the cable is at a first temperature, the pipe is made of a material that contracts more than optical fiber, when this cable is exposed to temperatures below the first temperature, so that the fiber is longer than the pipe and the length of the excess fiber is formed in relation to the pipe. A device that receives the fiber is provided to receive the excess fiber length when the pipe contracts more than the fiber. In a preferred embodiment the device receiving the fiber is an intermediate portion of the pipe and allows the length of the excess fiber to accumulate without bending at a radius less than the minimum bend radius. The present invention furthermore relates to a fiber optic cable assembly, comprising an optical fiber slidably enclosed within a hollow pipe, both the fiber and the pipe having first and second corresponding ends. The second we enter the fiber and the pipeline, they constrict with respect to each other. The first end of the fiber is constricted further, when the first end of the pipe is constricted. The cable is assembled at a first temperature and at a second lower temperature the pipe shrinks in length relative to the fiber and any excess fiber length accumulates beyond the first end of the pipe.

BRIEF DESCRIPTION OF THE DRAWINGS The accompanying drawings, which are incorporated and constitute a part of the specification, illustrate various aspects of the present invention and together with the description, serve to explain the principles of the invention. A brief description of the drawings is comp. follow. Figure 1 is a cross-sectional view of a fiber optic cable segment of the prior art; Figure 2 is a cross-sectional view of the prior art fiber optic cable segment, of Figure 1, at a reduced ambient temperature, where the ends of the fiber and cable jacket, are not constricted with respect to each other; Figure 3 is a cross-sectional view of the prior art fiber optic cable segment, of Figure 1, at a reduced temperature, where the ends of the fiber and cable jacket constrict with respect to each other; Figure 4 is a perspective view of a fiber optic cable including a loop housing, according to the present invention; Figure 5 is a perspective view of an optical fiber cable, of Figure 4, with the upper part removed from the loop housing; Figure 5A is a top view of an alternative embodiment of an optical fiber cable, according to the present invention, including a coupler within a loop housing, with the upper part removed from said housing; Figure 6 is a perspective view of an optical fiber cable and a divider, in accordance with the present invention; Figure 7 is a perspective view of an alternative embodiment of an optical fiber cable, including a loop housing and a splitter, mounted within this loop housing, according to the present invention, with the fiber and the splitter inside said housing, shown in hidden lines; Figure 8 is a side view with partial cross section of an alternative embodiment of an optical fiber cable, according to the present invention, including an intermediate portion of pipe, for receiving the excess fiber length; Figure 9 is a front perspective view of an optical fiber module, according to the present invention; Figure 10 is a top view of the fiber optic module of Figure 9; Figure 11 is a front view of the fiber optic module of Figure 9; Figure 12 is a top view of the fiber optic module of Figure 9, with the upper part of the module removed to allow visibility of the interior of the module; Figure 13 is a top view of a generalized arrangement of the optical fibers within the module of Figure 9; Figure 14 is a rear perspective view of one of the riser mounting blocks of the optical fiber, from the front of the module of Figure 9, with a single riser sleeve assembly mounted within one of the openings of mounting for the cover of one of the plurality of fibers extending from the divider; Figure 15 is a side view of the riser jacket pipe of optical fibers of Figure 13; Figure 16 is a view, with radially spaced pieces, of the fiber optic bundle jacket pipe assembly of Figure 15; Figure 17 is a side view of an optical fiber riser assembly for wrapping a fiber wave input to the splitter; and Figure 18 is a perspective view, with radially spaced pieces, of the single entry fiber, extending through the front of the module of Figure 9.

Detailed Description Reference is now made in detail to the exemplary aspects of the present invention which are illustrative in the accompanying drawings. Wherever possible, the same reference numbers will be used throughout the drawings, to refer to the same or similar parts. Optical fiber cables can be installed within telecommunication networks and exposed to extreme temperatures of outdoor air temperatures. These fiber optic cables are made of a variety of materials, including, but not limited to, the optical fibers, liners and coatings, and strength elements. Each of these constituent materials may have a different thermal coefficient of expansion, which means that the materials will be expanded or contracted at different rates due to temperature changes. The fiber optic cables of the prior art, in Figures 1 to 3, show the effect of reduced temperature on an optical fiber cable 10, which includes an outer jacket 12 and an optical fiber 14. The fiber 14 is retained , in sliding form, inside a hollow opening 16, defined by the sleeve 12. This sleeve 12 includes a first end 18 and a second opposite end 20, and the fiber 14 includes corresponding first and second ends, 22 and 24. In Figure 1, the cable 10 is exposed to a first temperature, so that the ends of the fiber 14 and the jacket 12 are aligned with each other. If the fiber 14 and the jacket 12 are originally of the same length at the time of assembly, this indicates that the first temperature is approximately equal to the ambient temperature, at which the cable 10 is assembled. This cable 10 can be a fiber optic drop cable, where the fiber 14 can slide freely within the opening 16 of the shirt 14. The first ends, 18 and 2, and the second end, 20 and 24, do not lock or constrict each other within of the cable 10. In Figure 2, the cable 10 has been exposed to a second temperature, below the first temperature. The fiber 14 has a coefficient of thermal expansion which is relatively less than a thermal coefficient of expansion of the jacket 12. At the second temperature, the jacket 12 has contracted much more than fiber 14. The ends, 22 and 24, of the fiber 14, extend beyond the ends 18 and 20, respectively, of the sleeve 12. The ends 22 and 24 of the fiber 14 are not constricted to the ends 18 and 20, respectively, and are free to move further. beyond the ends 18 and 20, as shown. The ends 22 and 24 extend beyond the ends 18 and 20, to define an excess length 15 of the fiber 14. Alternatively, one of the first or second ends of the fiber 14 and the jacket 12, may be constrained with respect to mutual, as long as the opposite ends are constricted and the fiber 14 can move freely within the opening 16 of the sleeve 12. In Figure 3, the cable 10 is now finished at each of the first and second ends, with a connector 26 of optical fibers. Such fiber optic connectors are well known in the art. To terminate the cable 10 in the connector 26, the jacket 1 and the fiber 14 are constricted with respect to each other. While the connector 26 of the optical fiber can provide some degree of movement in the compression of the fiber 14, the connector 26 does not allow the fiber 14 to extend beyond the connector 26. As shown in Figure 3, the cable 10 is exposed to the second lower temperature, and the jacket 12 has contracted to the same extent shown in Figure 2. However, in Figure 3, the ends 22 and 24 of the fiber 14 are now constrained at the ends 17. and 20 of the jacket 12 by the connectors 26. Thus, the shrinkage of the jacket 12 compresses the fiber 14 to the same length as the jacket 12. Known materials suitable for obtaining the optical fiber 12 are essentially non-compressible. The excess length 15 of the fiber 14 is forced to fit within a shorter length of the sleeve 12 and is forced into a series of micro-bends 28 within the opening 16. These micro-bends 28 can cause an excess of signal loss within the cable 10. While this cable 10 is shown as a single fiber cable and the connectors 26 are described as fiber connectors, it is anticipated that a cable including multiple optical fibers may be replaced by the cable 10 and a break of the cable. cable at the end of such a multi-fiber cable can be replaced by the connector 26, within the present invention. Referring now to Figures 4 and 5, a cable 30, in accordance with the present invention, includes a first jacket segment 33, a second jacket segment 34, the fiber and the connectors 26 at each end. As discussed above, both the fiber 14 and the jacket segments 32 and 34 are mutually constrained in the connectors 26. Mounted between the jacket segments 32 and 34 is a fiber receiving device 36. . As the fiber receiving device is shown is a fiber tie box 36, the fiber 14 extends from a first connect 26 through the jacket segment 32 within the box 36, forms a loop 38 and then extends through the jacket segment 34 to a second connector 26. When the cable 30 is exposed to a range of temperatures and segments, 32 and 34, of the jacket, it extends and contracts in response, any excess length of the fiber 14 is accumulated within the box 36. The loop 38 of the fiber 14 has a dimension to fit within the displacement of the box 36, from the inner surface 40.

This will allow the loop 38 to grow in size, without being limited by the inner surfaces 40, since the excess length 15 is incorporated within the loop 38. The box 36 must be sized to allow the formation of the loop, which is greater in diameter than the minimum bend radius of the fiber 14. Figure 5A shows an optical fiber cable 80, similar to the cable 30, with the addition of an optical device 84, such as a coupler mounted inside the case 36. Fiber 14 extends through the first cable segment 32 from the connector 26 within the case 36, which forms a loop 38 to receive the excess fiber length and is constricted in the optical device 84. Within the device 84, a portion of the signal transmitted by the fiber 14 is derived or split into a second fiber, such as the fiber 82. An extension 15 of the fiber 14 is constricted in the device 84 and extends out of the box 35 through the second shirt segment 34, to the connector 26. The fiber 82 extends from the device 84 out of the box 36. Both fibers, 15 and 82, form the loops 78 inside the box 36. Figure 6 shows an alternative embodiment of a fiber optic cable 46 , according to the present invention. The cable 46 includes the segments, 32 and 24, of fiber and the box 36 of the fiber loop. This optical fiber 13 (shown inside the concealed inline box 36) within the cable 46 is a single fiber cord, which carries a plurality of optical signals simultaneously. The segment 32 and the fiber 14 within the segment 32 are constricted at one end of the connector 26. At a second end of the segment 24 of the cable 46, a divider 42 is included. Fiber 14 and jacket segment 34 constrict with respect to each other, at one end of divider 42. Within case 36, fiber 14 forms a loop 38 to receive any excess fiber that can be formed when segments 32 and / 34 of shirt shrink more than fiber 14. At an opposite end of splitter 42 is a plurality of optical fibers 44. Each of these fibers 44 can carry one of the plurality of optical signals, from fiber 33 which is has separated from the other optical signals by the. splitter 42. As shown, eight optical fibers 4 extend from the splitter 42. Alternatively, individual fibers 44 may be combined into a single tape fiber, extending from the split 42 and individual fibers 44 that break out of the fiber 42. ribbon cable at a point removed from the divider 42. (The arrangement is shown in Figure 12, below). Figure 7 shows an alternative embodiment of an optical fiber cable 48, including a first jacket segment 32, with the connector 26 at one end. The segment 32 and the fiber 14 within this segment 32, are constricted in the connector 26. Within a fiber loop box 50, a divider 42 is mounted so that the fibers 44 extend from the box 50. the fiber 14 is constricted within the box 50 in the divider 42. The first sleeve segment is constricted in the opposite case 50 of the connector 26. The cable 48 does not include a second segment 34 of the length within which the fiber 33 extends. fiber optic loop 38 inside the box 50, between the sleeve segment 32 and the splitter 42, allows any excess length of wire 15, due to the shrinkage of the sleeve segment 32, to be absorbed without creating micro-bends, which could create an unwanted signal loss. As before, the fibers 44 can be combined into a single ribbon cable and separated into individual fibers at a point remote from said box 50. Figure 8 illustrates yet another alternative embodiment of a fiber optic cable 52, which includes a portion 56 wider than a cable jacket 54. Within the portion 56 is defined an enlarged segment 58 of opening 16, through which the fiber 14 extends. As described above, the ends 18 and 20 of the jacket 54 and the ends 22 and 24 of the fiber 14 they constrict with respect to each other, respectively. As the sleeve 54 contracts linearly, when exposed to low ambient temperatures, the excess length 15 of the fiber is collected within the curve 60 in the enlarged segment 58. This segment 58 is sized to allow the accumulation of the anticipated amount of excess fiber length 15, based on the overall length of the cable 52 and the percentage of shrinkage calculated at the lowest ambient temperature for which the cable 53 will possibly be subjected. This accumulation of excess fiber length 15 with the curve 60 will avoid the problem of forcing micro-bends within the opening 16, as shown earlier in Figure 3. Alternatively, the wide portion 56 and the segment 58 can be created in one or more standard sizes and the appropriate size incorporated in the cable 52, depends on the length of the cable 52 and the expected lower standardized ambient temperature. Referring now to Figures 9 to 11, a telecommunications module 100 is shown with an input fiber optic cable 103 and a plurality of output fiber optic retainers 10, mounted on the front 106. The module 100 includes a housing with an upper part 108, a pair of opposed sides 110, a bottom 112 (shown in Figure 12, below) and a rear part 114. The housing defines an interior 116 (also shown in Figure 12, below). As shown, the module 100 is a fiber optic splitter module, capable of separating an incoming fiber optic signal, from the cable 102, into up to thirty two output fiber optic signals, each being transmitted through an optical fiber. fiber optic output cable 118, terminated in a fiber optic connector 119. A cable 118 is shown in Figure 10. Each of the t-optical fiber retainers 104 is adapted to retain eight output wires 118. On each of the sides 110 is a mounting rail 120, adapted to mount the cable. module 100 to a rack of telecommunications equipment or similar structure. On adjacent sides 110, the surface 106 includes a pair of flanges 122, with one or more openings 124 of the fastener. These flanges 122 and the openings 124 assist with the assembly and secure the fastening to the module 100, to such a shelf or structure. Each of the fasteners 104. includes eight openings 126, each opening 126 adapted to receive one of the output fibers 118. On the front 106 there is a space 128 for receiving the indices identifying the module 100 or the cables extending to or from the module 100. At the top 108 there is a space for receiving a label 130. As shown, the front 106 is angled with respect to the rear 114 to assist access to the front 106 or cables 102 and 118 and to improve cable handling of these cables, which extend to and from the module 100. Figure 12 shows the module 100 with the upper part 108 removed to show the path of the optical fibers within the interior 116. The flanges 134 are included along the sides 110 to receive the fasteners retaining the top 108 to the module 100. Mounted on the interior 16 along one of the sides 110 is a divider 42. An optical fiber 136 from the cable 102 extends into the interior 115 through the front 106. The fiber 136 is formed in a loop 138 inside 115 prior to be direct is attached to a first end of the divider 42. An outer jacket of the cable 102 is terminated in and constrained to a cover 140 attached to the front 106. The fiber 136 extends through the loop 138 to the divider 42, around the interior 116. , to ensure that the minimum bend radius requirements prevent excessive signal loss from being maintained.

One or more cable clips 142 are mounted to the bottom 112 to assist in the arrangement of the cable 136 to the interior 116. Any contraction of the cable jacket 10 may result in the formation of an excess length 15 of the fiber 136. The loop 138 provides a site for accumulating any excess length 15 and avoids the creation of undesirably narrow folds of the fiber 136, within the module 100 or the cable 102. A plurality of ribbon cables 144 extend from the divider 42 opposite the fiber 136. This divider 42 separates the optical signals carried by the fiber 136 into up to thirty-two individual optical signals. Each ribbon cable 144 can include up to eight fibers 146, each fiber carrying one of those optical signals. The ribbon cables 144 extend from the divider 42 to the mounting retainers 104 on the front 106. The ribbon cables 144 form a loop 148 on the interior 116, between the divider 42 and the retainers 104. The wire fasteners 142 are provided to assist in the routing and organization of the loop 148 of the cables 144 and the cables 146 to the interior 116. This loop 148 is shown in the ribbon cables 144, with the fibers 146 being broken from the ribbon cables 144, briefly before the fibers 146 enter the opening 127 of the retainers 104. Alternatively, individual fibers 146 may extend from the divider 42 around the loop 148 without included ribbon cables to the interior 116. The fibers 146 can be freely slipped within the frames of the cables 118 and both the truck and the fibers 146 are terminated and constricted in the connector 119. The cables 118 are also constrained in the retainers 104, as will be described below. The fibers 146 extend through the retainer 104 to the ribbon cables 144 and these ribbon cables 144 are constricted in the divider 42. In an alternative, where the fibers 146 extend from the retainers 104 to the divider 4, the fibers 146 are constricted in the divider 42. Any excess length 15 of the fiber 146 within the cable 118, created due to the shrinkage of the cable jacket 118, is accumulated to the interior 116 by the loop 148. Figure 13 shows a top view Generalized of the elements 116. Only one of the ribbon cables 144 is completely shown and it should be understood that the other ribbon cables 144 are similarly constructed. At one end 145 of the ribbon cable 144, individual fibers 146 are broken. Only three fibers 146 are shown for clarity. The fibers 146 extend through an opening 126 of one of the retainers 104 within a bifurcation tube assembly 148. Figure 14 dies an inner face 105 of the retainer 104 with an assembly 148 of the branch tube within one of the openings 126. This assembly 148 of the branch tube includes a hollow inner tube 150 and a hollow outer tube 152. This outer tube 152 includes an opening, inside which the inner tube 150 is inserted. Other elements may also be included within the opening of the outer tube 152 around the inner tube 150. These elements may include, but are not limited to, strength elements or the like. The inner tube 150 includes an opening through which the fiber 146 can be slidably inserted. Figures 15 and 16 show the assembly 148 of the bifurcation tube in further detail, including a mounting collar 154, with a front portion 153 with a dimension to be inserted into one of the openings 126 of the retainer 10. The front portion 153 may be slightly over-dimensioned with respect to the opening 126 to promote a friction fit within the opening 126. Alternatively, an adhesive or some mechanical element may be used to secure the mounting collar 154 within the opening 126. Mounting collar 154 includes a central hollow opening, through which the inner tube 150 extends. A rear portion 155 of the mounting collar 154 has a dimension to extend into the opening of the outer tube 152 around the inner tube 150. A resistance element 158 is shown in Figure 16, which extends from between the inner tube 150 and the outer tube 152. This resistance element 158, as shown, is made of aramid fiber, such as Kevlar®, but other suitable materials can also be used. When the rear portion 155 is positioned between the inner tube 150 and the outer tube 152, the resistance element 158 is overlapped at the rear portion 155. A corrugated sleeve 156 fits around the outer tube 152, above the rear portion 155 of the 154 assembly and corrugated collar to retain these elements together. An adhesive can also be applied to the site 160, where the inner tube 150 extends through the mounting collar 154, to ensure that the inner tube 150 remains fixed within the assembly 148. Figures 17 and 18 show further details of the input fiber 102 and cover 140 and its assembly to module 100. An aperture 162 in front 105 receives an insert 164 and a threaded portion 163 of a cable assembly 166, from the external module 100. Inside the interior 116, a washer 158 and a nut 170 are placed on the threaded portion 163 of assembly 166 and secure this assembly 166 to the front 106. In Figure 17, an outer sleeve assembly 177 for the input wire 102 includes a hollow inner tube 174 with a opening for receiving an optical fiber 136. A hollow outer tube 176 is placed around the inner tube 174 and a resistance element 178 is placed between the inner and outer tubes. This inner tube 174 is inserted through the cable assembly 166, so the resistance element 178 is placed around as a corrugated portion of the cable assembly 166. A corrugated sleeve 172 is placed in the eternal tube 176 and the resistance element 178 and corrugated around the corrugated portion 165 to retain these elements together. The cover 140 is placed around the corrugated sleeve 172 to provide stress relief and protection to the cable 102 and its connection to the module 100. The above specification, examples and data provided a complete description of the manufacture and use of the invention. Since many embodiments of the invention can be made without departing from the spirit and scope of the invention, this invention resides in the claims set forth below.

Claims

CLAIMS 1. A set of fiber optic cable, which comprises: an optical fiber, enclosed, in sliding form, inside a hollow pipe, both this fiber and the pipe have first and second corresponding ends; the cable being terminated with the first ends of the pipe and the fibers constrained with respect to each other, so that the fibers and the pipe are approximately the same length, when they are at a first temperature; This pipe is made of a material which contracts more than the optical fibers, when said cable is exposed to temperatures below the first temperature, so that the fiber is longer than the pipe and the length of the excess fiber is formed; and in that a device that receives the fibers allows the length of the excess fiber to accumulate, without bending in a radius less than a radius of double minimum.
2. The fiber optic cable of claim 1, wherein the fiber receiving device includes an intermediate portion of pipe, which allows the excess fiber length to accumulate without bending at a radius less than the minimum bend radius.
3. The fiber optic cable of claim 1, wherein the fiber receiving device includes a box, a first and a second intermediate ends of the pipe attached to the box and the fiber passing through said box.
4. The fiber optic cable of claim 3, wherein the optical fiber forms a loop within the box.
5. The fiber optic cable of claim 2, wherein the intermediate portion of the hollow pipe defines a larger internal diameter than the rest of the pipe.
6. The fiber optic cable of claim 1, wherein the first end of the fiber and the first end of the pipe are terminated in an optical fiber connector.
7. The fiber optic cable of claim 5, wherein both the first and the second ends of the fiber and the pipe are terminated by an optical fiber connector.
8. The fiber optic cable of claim 6, wherein the second end of the fiber and the second end of the pipe are terminated in an optical signal divider.
9. A complete set of optical fibers, which comprises: an optical fiber, enclosed, in slidable form, inside a hollow pipe, both the fiber and the pipe have first and second corresponding ends; the second ends of the fiber and the pipe end together and constrict with respect to each other; the first end of the pipe is constricted: where the cable is assembled at a first temperature and a second lower temperature the pipe shrinks in length, with respect to the fiber and any excess fiber length accumulates beyond the first end of the tube.
10. The fiber optic cable assembly of claim 9, wherein the first end of the pipe is constricted in an outer wall of a housing of a module and the first end of the fiber is constricted to the interior of the module at one end of a housing. optical component.
11. The fiber optic cable assembly of claim 10, wherein the optical component within the module is a divider.
12. The fiber optic cable assembly of claim 11, wherein the plurality of optical fibers extend from the splitter.
13. The fiber optic cable assembly of claim 9, wherein the second ends of the fiber and the pipe are constricted in an optical fiber connector.
14. The fiber optic cable assembly of claim 10, wherein the module further includes an optical fiber input cable, this optical fiber input with an optical fiber, received, in a sliding manner, within a hollow pipe, the fiber and the pipe have first and second corresponding ends, the first ends of the pipe and the fibers, are constricted with respect to each other, the second end of the pipe of the input wire is constricted in a front of the module and the second end of the fiber of the input cable is constrained to the interior of the module, in a second end of the optical component, the fiber of the input cable forms a loop to the interior, which accumulates any excess length of the fiber formed by a contraction of the cable pipe of entry.
15. The fiber optic cable assembly of claim 14, wherein the shrinkage of the inlet cable pipe is due to a decrease in temperature.
16. A fiber optic cable assembly, comprising: an optical fiber, enclosed, in sliding form, inside a hollow tube, both the fiber and the tube have first and second corresponding ends; the first ends of the fiber and the tube are finished and constricted with mutual respect; the second end of the tube is constricted in a cable tie box, with the second end of the fiber extending into the interior of the cable tie box; the second end of the fiber constrained in an optical device mounted within the fiber tie box, the fiber formed in a loop within the fiber tie box, between the second end of the pipe and the second end of the fiber , in which the cable is assembled at a first temperature and at a second lower temperature the pipe shrinks in length relative to the fiber, to form an excess length of the fiber and any excess length of the fiber accumulates in the fiber. the fiber tie, inside the fiber tie box.
17. The fiber optic cable assembly of claim 16, wherein the optical device is a divider.
18. The fiber optic cable assembly of claim 16, wherein the first ends of the fiber and the pipe are terminated in a connector.
19. The fiber optic cable assembly of claim 16, further comprising a second fiber, extending from the optical device and out of the box in a second hollow tube, the second fiber and the second tube having first and second ends correspondingly, the first end of the fiber is constricted in the optical device, the first end of the tube is constricted in one wall of the box, the second ends of the second fiber and the second tube are terminated and constricted with mutual respect, the second fiber forms a loop within the box, between the first end of the fiber and the first end of the tube, to receive the excess fiber length, formed by the contraction of the tube.
20. The fiber optic cable assembly of claim 19, wherein the second ends of the second fiber and the second tube are terminated in an optical fiber connector.
21. The fiber optic cable assembly of claim 19, wherein the optical device is a splitter and a plurality of second fibers extend from the splitter outside the box, in a plurality of second tubes.
22. A method for assembling an optical fiber cable, this method comprises: providing an optical fiber and a hollow pipe, this pipe is made of a material which contracts more than the optical fiber, when the cable is exposed to temperatures below the First temperature, both the fiber and the pipe have first and second ends; the sliding of the fiber inside the pipe; providing a fiber receiving device between the first ends of the fibers and the pipe and the second ends of the fibers and the pipe; terminate the cable with the first ends of the pipe and the fiber constrained with respect to each other and the second ends of the pipe and fiber constrained with respect to each other, so that the fibers and the pipeline are approximately the same length. when they are at a first temperature; exposing the cable to a second temperature, lower than the first temperature, and forming the excess fiber length as the pipe contracts more than the fiber; accumulate excess fiber within the fiber receiving device, without bending, in a radius less than a minimum bending radius.
23. A method of assembling a fiber optic splitter module, this method comprises: providing a splitter, with at least one optical fiber extending from opposite ends of the splitter, each of the optical fibers having a constricted first end n the splitter and a second extreme opposite; placing the divider inside the interior of a housing, forming each optical fiber in a loop, inside the housing and extending the second end to the outside of the housing, sliding a hollow tube over the second end of each optical fiber, so that a first end of each tube is constricted in an outer wall of the housing and a second end of each tube is adjacent to the second end of the fiber, inside the tube; ending constrained with respect to each other, the second ends of the tubes and the fibers within the tube; accumulate any excess fiber length, created by the contraction of the tube 'inside the loop to the interior of the housing.